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555 multi-function digital control lock circuit

2017-01-07 03:19  
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555 multi-function digital control lock circuit
As the figure 15-20 shows, the multi-function digital control lock uses the digital control lock ASIC LS7225 as the core, and this control lock circuit is composed of the trigger timing circuit, the audio circuit and some RC components. The IC1 uses the digital control lock ASIC LS7225, it's output port function diagram is as shown in figure (b). If you press the wrong password, the 555 has the high electric potential, and this electric potential is paraphased by VT1 to set the IC3, the J2 closes to open the IC4(KD9561) sound alarm circuit and the radio transmitting circuit, they send out the ear-piercing alarm or transmit the FM. If you use the wireless receiver, you should turn the high-frequency carrier wave in the amateur band such as 88~108MHz.